Stroller frame



FIG. 1 is a perspective view of a stroller frame showing my new design;

FIG. 2 is a front view of the stroller frame of the new design;

FIG. 3 is a rear view of the stroller frame of the new design;

FIG. 4 is a top view of the stroller frame of the new design;

FIG. 5 is a bottom view of the stroller frame of the new design;

FIG. 6 is a left-side view of the stroller frame of the new design; and,

FIG. 7 is a right-side view of the stroller frame of the new design.

The broken line showing is included for the purpose of illustrating environment and forms no part of the claimed design. 

The ornamental design for a stroller frame, as shown and described. 